Abstract

The reverse micellar phase L2 of the triblock copolymer poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide) EO13PO30EO13 (commercial name Pluronic L64), where EO is ethylene oxide and PO is propylene oxide, was studied in the ternary mixture L64/water/o-xylene and in the binary mixture L64/water, using ESR spectroscopy with nitroxide spin probes. The spin probes differed in size, structure, and polarity and belong to two main types: (a) cationic probes 4-(N,N-dimethyl-N-alkyl)ammonio)-2,2‘,6,6‘-tetramethylpiperidine-1-oxyl iodide (CATn) with n, the number of carbon atoms in the alkyl substituent, equal to 1, 4, 8, 11, and 16; (b) amphiphilic probes based on x-doxylstearic acid (xDSA) with x, the carbon atom to which the doxyl group is attached, equal to 5, 7, 10, and 16. X-band ESR spectra reflect the intercalation of the probes in the self-assembled L64 system, but different probes choose different locations in the aggregates and report on the local polarity, hydration, and degree of ord...

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